See what our Experts say about this Pollak Trailer Wiring

• How to Add a Center Mounted Third Brake Light to a Trailer
  Although it is not required by law, what you are wanting to do is certainly possible. Because trailer tail light systems combine the stop lamp and turn signals for each side onto a single circuit, you will need to use a vehicle-to-vehicle tail light converter, part # 118158 to split the brake light circuit back out. The white wire on the input side of the converter would ground to the trailer frame, the green input wire would tap into the right turn circuit on the trailer and the yellow...
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• Testing for Proper Voltage on the Brake Output Circuit
  There are many things that can affect the voltage on the brake output wire from your brake controller to your trailer brakes such as the power setting on your brake controller, how you are testing the wire and if you are testing it with the brakes or manual override activated. Using a multimeter to test the voltage on the brake output wire at your trailer connector will not always give the proper reading because it does not provide a load on the circuit like brake magnets from a trailer...
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• Wiring a 7-Way Round Pin European Trailer Connector
  Usually a brown wire contains the running light circuit. However, you cannot go by wire color because it always varies from trailer to trailer. You will want to trace the wire back to where it leads on the trailer to determine its function and then make the connection in the trailer connector as needed. If you have a European 7-Way then it will be a little different. I have included a picture that shows the typical functions of a European 7-Way.
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• How to Adapt a 7-Way Round Connector to a 7-Way Flat
  The easiest way to go from a 7-way round connector to a 7-way flat would be to get a Trailer Connector Adapter part # HM47425. However, if you are looking for a more permanent solution you would need to remove your 7-way round connector and wire up the trailer wiring to a 7-way flat connector like part # PK12706. In order to do that check out the different diagrams I attached that will help you wire up the new connector. The wiring could be different so you may need to verify the functions...
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• Troubleshooting 7-Way to Semi 7-Way Adapter Stoplights Not Working
  The problem you most likely are experiencing is due to fact that semi trucks have the turn signals and stoplight circuit on separate circuits/wires. Standard trailer wiring has the stoplight and turn signal circuits on the same wire. So in your situation you would need to wire in the Hopkins Tail Light Converter part # HM48847 on just the stoplight and turn signal circuits and you'll be good. A brake controller would not affect the stoplight circuit at all.
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• Troubleshooting Pollak Trailer Connector Adapter Not Working With Kioti DK5010 Tractor
  Hi Forrest; because of the way an agricultural 7-way is wired the # PK12-724 is not a good solution. The best thing you can do is run a 7-way blade and connect straight to the trailer. Right now you don't have a brake output pin and it sounds like 12V power is carrying over so the brakes are constantly activated. Also, your tractor will have separate brake light and turn signals which won't work with the Big Tex trailer. To accomplish this you can use the # 337TC1474P along with the #...
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• Should Blue Wire on Trailer Have Power
  The blue wire on a trailer is typically the output wire to the electric brake assemblies. If this is the case on your trailer then the wire should only have power when you are hooked up to the tow vehicle and are applying the brakes, either by pushing on the brake pedal or by using the manual override lever on the brake controller. Since trailer wiring colors aren't always consistent I do recommend verifying that this is the function of your blue wire. You can simply follow the wire along...
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• Connecting Tractor With 7-Pole Round to Trailer With Electric Brakes
  Hi Sergey; it sounds like you have a 7-pole round on your tractor and then either a 6-pole round or 7-way blade on the trailer. The # 119178 you ordered will combine your brake light and turn signals so that is a good start. Since there are no adapters available as is you will have to make one just like in the other question you looked at. You will need the # PK11700, # DW04914-1, and then # PK11893 (if the trailer has a 7-way blade) or # PK11609 (if the trailer has a 6-pole round). You...
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• Looking For A 7 Round Trailer End Plug And Lead To Replace On My Trailer
  Hey Phil, Since those 7 round connectors are not as common any more we only carry the plug itself like the Pollak # PK11700. This is the 7 way round pin that you have. There is no lead on the plug itself but it does take 8 to 16 gauge wire, typically 12 gauge is what I see used with this plug. Something like the # DW04914-1 would work well for you. What kind of trailer are you wiring up?
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• 7-Way Round to 4-Way Flat Adapter for Semi Truck
  Hi Richie; there are no adapters that are designed for this but you can make your own. A standard adapter like the # 47405 works with your standard 7-way and trailer wiring which doesn't require a converter. The lights on your semi are separate which means a converter will be required to make it compatible with the combined lights on your trailer. You can put this together using the Pollak 7-Pole Round Pin Connector # PK11700, Hopkins Tail Light Converter # HM48847, and Hopkins 4-Way Flat...
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• 7-Way Round Pin to 7-Way Flat Blade Adapter W/Compatible Brake Controller To Control Trailer Brakes
  As your 7-Way pin connector uses separate turn signals and brake light wiring you will need the to create a custom harness to be able to have everything function properly including the electric brakes. First you will start with the Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector # PK11700 to connect to your vehicle. You will be able to connect the Hopkins Tail Light Converter # HM48847 and Hopkins Endurance Quick-Install 7-Way Trailer Connector # HM47210 to the appropriate...
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• How to Make 7-way to 6-Way Adapter for Semi Truck to Gooseneck
  Your semi-truck is going to have separate turn signals from the stop lights and your gooseneck trailer is going to have combined turn signals and stop lights. This means you would have to build an adapter that has a signal light converter so that your trailer can be towed with your truck. You would need to start with a 7-way male connector part # PK11893 to plug into your semi truck. For wiring you would then want the part # DW04914-1 sold by the foot. Then for the signal converter you...
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• How To Tow a Gooseneck Trailer with Brakes Using a Semi Tractor
  In order to haul your gooseneck trailer with a fleet of semi-tractors you will need to make your own adapter harness which will then make for a plug and play connection but they don't make anything pre-assembled for this out of the box to my knowledge. In order to make the adapter you will need the Pollak Heavy-Duty, 7-Pole, Round Pin, Trailer Wiring Connector part # PK11700, the Roadmaster Brite-Lite Wiring Converter part # RM-732, and the Pollak Black Plastic, 7-Pole, RV Blade-Style Trailer...
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• Parts Needed to Connect Gooseneck Trailer to Semi-Truck 7 Pole Round Plug
  You can use the Pollack # PK11700 to install on your gooseneck trailer and create a 7 way plug capable of fitting on the 7 pole round plug that is on a semi tractor trailer truck. For the wiring you can use the Deka Jacketed 7 Wire # DW04914-1 which is a jacketed 7 wire sold by the foot that will allow you to connect to your trailer's wiring and the plug. If you just want to go the adapter route, you can use the # HM47425.
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• Is it Normal to Only See 9 Volts on the Output Circuit of a Brake Controller
  Brake controllers allow you to vary the voltage applied to the trailer brakes to allow for different braking power. If the controller is set to it's max output voltage it should be right at 12 volts. Be sure to have the vehicle running too so that you don't see any voltage drop off just from the alternator. If the controller has it's gain turned all the way up and it's only at 9 volts then that would indicate you have an internal problem and the controller would need to be replaced. I...
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• How to Make a 5-Way Round Pin to 7-Way Round Pin Trailer Connector Adapter
  A 5-Way Round to 7-Way Round trailer adapter is not available, but I can tell you how to make one and what you will need. If the 5-Way round is on the vehicle, you will need the following: 5-Pole, Round Pin Trailer Wiring Connector, # PK11501 7-Pole, Round Pin Trailer Wiring Socket, # PK11720 7-Pole Rubber Socket Boot, # PK11761 Jacketed 6 Wire - per foot, # DW04906-1 (get 2 feet worth) Start by testing the functions of the 5-Way with a circuit tester, # PTW2993 if needed. Once you know...
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• What Are Wiring Codes for a Pollak 7-Pole Round Pin Connector
  I have attached a photo of the Pollak Heavy-Duty, 7-Pole # PK11700 as viewed from the front with all of the correct wiring connections noted. 12:00 - White Wire is Ground. 2:00 - Brown Wire - Tail and Running Lights. 4:00 - Green Wire - Right Brake and Turn. 6:00 - Purple Wire - Reverse Lights. 8:00 - Yellow Wire - Left Brake and Turn. 10:00 - Black Wire - 12v Battery Power. Center - Blue wire - Brake Control Output. The pin at 2:00 position is the correct pin that carries the signal for...
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• Recommended 7-Way to 4-Way Adapter for 2018 VW Atlas
  To convert the 7-Way on your 2018 VW Atlas to a 4-Way, I recommend using the Pollak Adapter # PK12716. This will plug right into the Pollak 7-Way on your vehicle and provide you with a 4-Way flat on the other end. It also features a nice tethered cap to protect the connector from debris and corrosion. I have attached a short video demonstration on this adapter that you can also check out.
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• How Many Volts Should I Get to the Trailers Brakes When Pressing the Brake Pedal
  You should get 12 volts coming from your brake controller if the controller is set on its highest setting. If your not, the first thing to do is to examine the trailer connector for any corrosion or debris and clean it if necessary. You'll also want to check the ground wires for the magnets and the brake circuit wire from the brake controller for any damage or pinches.
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• 7-Way Blade to 7-Pin Adapter for Towing a Trailer with A 7-Pin Connector
  The wiring for the 7-Pin connector is different than the 7-Way blade connector. You will need an adapter to make the two different styles compatible. You can use the Adapter 7 Way (Blade) to 7 Way (Round Pin), # 47595. The blade end plugs into the 7-Way on your vehicle and the trailer round pin 7-Way will plug into the receptacle. I have also included a link to a wiring FAQ article that shows how the two styles differ from one another.
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• 7-Pin Agricultural Vehicle Connector To 4-Pin Flat Trailer Connector
  Due to your 7-pin connector not having combined tail lights and brake lights you will need to create an adapter using the following parts. The Pollak Heavy-Duty, 7-Pole # PK11700 will connect to your 2012 John Deere 5045d tractor. You will wire the Hopkins Tail Light Converter # HM48847 to this. The 5 wires from the converter will attach to the 7-pin connector as seen in the image below. Then you will be able to attach the Hopkins Endurance Easy-Pull Harness # HM48058 to the 4 wires on...
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• Troubleshooting Trailer Brake Controller That Outputs 4 Volts with No Brake and No Manual Override
  If you are testing at your vehicle's 7-way and are detecting just over 4 volts on the brake circuit when neither the brake pedal nor manual override are engaged then you may have a bad controller, or you could have a short in your trailer socket that is allowing the 12V power circuit to bleed over to the brake circuit. Carefully inspect the 7-way (inside and out) for signs of corrosive build-up that could be bridging circuits. If you are testing the controller's output on the blue wire...
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• How to Wire in a New 7-Way to a 1997 Dodge Ram 2500
  We don't have a wiring diagram that details what your trailer connector wiring would be based on color but I can give you an easy way to determine this. You will need a circuit tester like part # PTW2993 and you will want to test each of the wires for voltage when the different turn signals are applied. You might use masking tape to label each wire to make this easier. Once you have all of the wires sorted out you will then want to wire them to your new connector using the diagram I attached...
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• Brakes Lock Up On Trailer When Plugged Into 2015 Chevy Silverado 2500
  I am almost certain that the issue is that the connector on your 2015 Chevy Silverado 2500 and the one on the trailer are pinned out differently. I have included a picture that shows how a vehicle and trailer side 7-Way are wired (ignore the colors and go by function). It sounds like the brake output pin on the trailer is matched up with the 12 volt pin on the truck. As soon as you plug in the trailer the brakes will be getting 12 volts so they lock up. All you have to do is configure...
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